<h2>Why is this an issue?</h2>
<p>Regardless of the logging framework in use (logback, log4j, commons-logging, java.util.logging, …​), loggers should be:</p>
<ul>
  <li> <code>private</code>: never be accessible outside of its parent class. If another class needs to log something, it should instantiate its own
  logger. </li>
  <li> <code>static</code>: not be dependent on an instance of a class (an object). When logging something, contextual information can of course be
  provided in the messages but the logger should be created at class level to prevent creating a logger along with each object. </li>
  <li> <code>final</code>: be created once and only once per class. </li>
</ul>
<h3>Noncompliant code example</h3>
<p>With a default regular expression of <code>LOG(?:GER)?</code>:</p>
<pre>
public Logger logger = LoggerFactory.getLogger(Foo.class);  // Noncompliant
</pre>
<h3>Compliant solution</h3>
<pre>
private static final Logger LOGGER = LoggerFactory.getLogger(Foo.class);
</pre>
<h3>Exceptions</h3>
<p>Variables of type <code>org.apache.maven.plugin.logging.Log</code> are ignored.</p>

